Ex-USC quarterback Todd Marinovich -- who also played for the L.A. Raiders -- was arrested for possession of meth in Irvine, CA ... TMZ Sports has learned.
We spoke with Commander Hallinan of the Irvine PD who tells us they got a call about a naked man on the Venta Spur walking trail on Friday night ... and officers eventually found Marinovich in a nearby backyard.
Marinovich was still naked when cops arrived. We're told he was cooperative.
Cops searched the area and found a brown bag containing meth, weed and Todd's I.